#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

void fun(int x, int y) {
	int z = 0;
	z = y;
	y = x;
	x = z;
}

int main() {
	int a = 7;
	int b = 77;
	printf("a=%d,b=%d \n", a, b);
	fun(a, b);
	printf("a= %d,b=%d \n", a, b);
	return 0;
}